Mac client keep opening MineField

Being a web developer and all I keep a number of Firefox installations, together with one of MineField (the alpha of FF3). Because I need them to play nicely with each other I enabled initial ProfileSelection on browser startup.

Most of the time I work in FF2, but for some reason, RescueTime starts my MineField every few minutes, where it stops on ProfileSelection screen.

If I select a profile and MineField running it works, yet it is very annoying.
 
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